To stop Savitar from killing his beloved Iris West, the Flash (Grant Gustin) teams up with Captain Cold (guest star Wentworth Miller) to retrieve an alien power source, left by the invading alien Dominators, to power up the Speed Force Bazooka to trap Savitar. Remember: It’s not a gun, it’s a bazooka. Big difference.

Anywho, as Barry and Leonard Snart infiltrate the A.R.G.U.S. facility and head towards confronting King Shark, Barry and Snart wander around the A.R.G.U.S. cells, all of which are designated to specific metahuman criminals. Gorilla Grodd and Cupid, from Arrow, all have their own rooms, but one, in particular, has never been seen in either Arrow or The Flash: Cheetah, one of the most infamous foes of Wonder Woman. If Cheetah is enough of a major villain that A.R.G.U.S. has a room for her, does that mean Wonder Woman exists on Earth-1?

Based on the track record of the Arrowverse, not necessarily. Major Batman villains like Ra’s al Ghul and Deathstroke have been enemies of Oliver Queen in Arrow, but there’s no sign that Batman is active in the continuity. Bruce Wayne definitely exists, though; in the future, Wayne Tech merges with Oliver Queen’s corporate empire, according to a newspaper article shown in The Flash.

From "Infantino Street" on 'The Flash.'

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And this isn’t the first hint at Wonder Woman in The Flash, either. On Earth-2, Barry had a “Diana” on speed dial. Seems as if Earth-2 Barry Allen is BFFs with Earth-2’s Diana Prince. Now, why won’t they form a Justice League?